165172422 has 16 divisors (see below), whose sum is σ = 331729920. Its totient is φ = 54826632.

The previous prime is 165172379. The next prime is 165172451. The reversal of 165172422 is 224271561.

It is a self number, because there is not a number n which added to its sum of digits gives 165172422.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56158 + ... + 59025.

It is an arithmetic number, because the mean of its divisors is an integer number (20733120).

Almost surely, 2^165172422 is an apocalyptic number.

165172422 is an abundant number, since it is smaller than the sum of its proper divisors (166557498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165172422 is a wasteful number, since it uses less digits than its factorization.

165172422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115427.

The product of its digits is 6720, while the sum is 30.

The square root of 165172422 is about 12851.9423434748. The cubic root of 165172422 is about 548.6716395045.

The spelling of 165172422 in words is "one hundred sixty-five million, one hundred seventy-two thousand, four hundred twenty-two".